~migration of birds into a new habitat ~pollen blowing in from plants in a far-away habitat ~fish swimming in to a new habitat in a river ~seeds being carried to an island on the ocean waves the four examples listed above could all be responsible in the change in a gene pool, also called adaptation founder effect genetic drift gene flow

The four examples listed above could all be responsible in the change in a gene pool also called founder effect. The founder effect is the reduction of genetic variation that occurs when a new population is started by a few members of the original population. Under the founder effect, a small population of a species is physically isolated from the original population,and the isolation prevents breeding between the two populations.